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round shaped ic in calculators and other devices

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devil6600

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i have seen in many calculators and other cheap hand held game consoles (especially from china) that they use a round shaped IC inside instead of a square or rectangular. why is it so and why round shaped?
thanks
 

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epoxy/resin casted IC

---------- Post added at 04:22 ---------- Previous post was at 04:18 ----------

Moisture resistance, high temp for reflow ovens, etc.
 

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